Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau

NWIPB OpenIR

	Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau
	Duan, Yuan-Wen 1; Dafni, Amots 3; Hou, Qin-Zheng 1; He, Ya-Ping 1; Liu, Jian-Quan 1,2
	2010-06-01
发表期刊	JOURNAL OF INTEGRATIVE PLANT BIOLOGY
ISSN	1672-9072
卷号	52 期号:6 页码:593-599
文章类型	Article
摘要	Delayed selfing could provide ovules with an opportunity to be fertilized as a means of "pollination assurance" before the flowers wilt. It could, thus, be regarded as an adaptation to unpredictable pollinator environments. Within the alpine biennial Gentianopsis paludosa, the showy flowers and herkogamy at the early stage of a flower's life cycle may favor outcrossing. As the flower ages, anthers contact the central stigma due to the elongation of all filaments, resulting in autonomous selfing. Flower visitors are extremely rare in a high altitude population; and examination of the mating system indicates that G. paludosa is self-pollinated under natural conditions in this population. While at the lower altitude, the bumblebee visitation rate is relatively high but possibly unreliable. Stigma receptivity is the highest on the third day of anthesis, and decreases thereafter. Pollen viability is the highest when flowers open, and gradually decreases later. Self-pollination of G. paludosa occurs at the late stage of a flower's lifecycle when stigma receptivity and pollen viability have both decreased, suggesting delayed selfing and assurance of seed production. This delayed selfing could assure seed production under the constraints of pollinator scarcity, but ensure outcrossing when pollinators were available. Such a flexible pollination mechanism is highly adaptive in the alpine environment of the Qinghai-Tibetan Plateau.; Delayed selfing could provide ovules with an opportunity to be fertilized as a means of "pollination assurance" before the flowers wilt. It could, thus, be regarded as an adaptation to unpredictable pollinator environments. Within the alpine biennial Gentianopsis paludosa, the showy flowers and herkogamy at the early stage of a flower's life cycle may favor outcrossing. As the flower ages, anthers contact the central stigma due to the elongation of all filaments, resulting in autonomous selfing. Flower visitors are extremely rare in a high altitude population; and examination of the mating system indicates that G. paludosa is self-pollinated under natural conditions in this population. While at the lower altitude, the bumblebee visitation rate is relatively high but possibly unreliable. Stigma receptivity is the highest on the third day of anthesis, and decreases thereafter. Pollen viability is the highest when flowers open, and gradually decreases later. Self-pollination of G. paludosa occurs at the late stage of a flower's lifecycle when stigma receptivity and pollen viability have both decreased, suggesting delayed selfing and assurance of seed production. This delayed selfing could assure seed production under the constraints of pollinator scarcity, but ensure outcrossing when pollinators were available. Such a flexible pollination mechanism is highly adaptive in the alpine environment of the Qinghai-Tibetan Plateau.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	SWERTIA-PRZEWALSKII GENTIANACEAE ; REPRODUCTIVE ASSURANCE ; POLLINATION ; SCROPHULARIACEAE ; FERTILIZATION ; ZINGIBERACEAE ; ECOLOGY ; PLANTS ; ENVIRONMENTS ; MECHANISM
收录类别	SCI
语种	英语
WOS研究方向	Biochemistry & Molecular Biology ; Plant Sciences
WOS类目	Biochemistry & Molecular Biology ; Plant Sciences
WOS记录号	WOS:000278033800009
引用统计	被引频次：39[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1684
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, NW Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Peoples R China 2.Lanzhou Univ, MOE Key Lab Arid & Grassland Ecol, Lanzhou 730000, Peoples R China 3.Univ Haifa, Fac Sci & Sci Educ, Lab Pollinat Ecol, Inst Evolut, IL-31905 Haifa, Israel
推荐引用方式 GB/T 7714	Duan, Yuan-Wen,Dafni, Amots,Hou, Qin-Zheng,et al. Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau[J]. JOURNAL OF INTEGRATIVE PLANT BIOLOGY,2010,52(6):593-599.
APA	Duan, Yuan-Wen,Dafni, Amots,Hou, Qin-Zheng,He, Ya-Ping,&Liu, Jian-Quan.(2010).Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau.JOURNAL OF INTEGRATIVE PLANT BIOLOGY,52(6),593-599.
MLA	Duan, Yuan-Wen,et al."Delayed Selfing in an Alpine Biennial Gentianopsis paludosa (Gentianaceae) in the Qinghai-Tibetan Plateau".JOURNAL OF INTEGRATIVE PLANT BIOLOGY 52.6(2010):593-599.